、發明說明： 【發明所屬之技術領域】 本發明是有關於一種可變焦的鏡頭結構，特別是指一 種薄型化變焦鏡頭。 【先前技術】 參閲圖1、2、3所示，在申請案號92103422號發明專 利中揭露習知一種裝設於一相機（圖未示）内變焦鏡頭1 的部份組件》 該變焦鏡頭1包括一具有一導滑斜面ιη的底座u、 一具有三線性導軌121的直進環12、一鏡擺單元13，及一 直進筒14 «>該鏡擺單元13具有一樞接部131、一可於該導 滑斜面hi上滑動的導滑塊132,及一相反於該樞接部131 的鏡片組133 » 該直進筒14具有一偏心支點141，及三對應該等線性 導軌121的線性導槽142。該偏心支點141是供該鏡擺單元 13的樞接部131樞接，該直進筒14可藉由該等線性導槽 142为別與該等線性導執121的滑動配合靠近遠離該直進 環12，而該直進環12也可被一位於該直進筒14外的凸輪 筒（圖未示）帶動沿—光轴z靠近、遠離該底座ιΐβ 當該直進筒14與該直進環12分別被帶動沿該光軸ζ 靠近該底座11時，該導滑塊132於該導滑斜面m上滑動 :進而使該鏡擺單S 13以該框接部131為中心而於該直進 筒14内擺動遠離該光軸z，此時該相機是關機狀態該 鏡擺單元134a對該光軸2是在一退避位置（見圖 相反地，當該直進筒14與該直進環12分別被帶動沿 該光軸Z遠離該底座11時，該導滑塊132於該等滑斜面 111上滑動，該樞接部131内的一扭轉彈簧（圖未示）產生 的彈性恢復力，驅使該鏡擺單元13以該樞接部131為中心 擺動並靠近該光軸Z，此時，該相機是開機狀態，該鏡擺單 元13相對該光轴z是在一拍攝位置（見圖3)。 該鏡擺單元13雖可於該直進筒14内部擺動退避遠離 該光軸Z ’使該鏡頭1於收納時薄型化，然而該鏡頭1卻存 在著以下缺點：該直進筒14必須提供足夠的空間供該鏡擺 單元13於其内擺動，因此該直進筒14的筒徑必須夠大， 而該直進筒14外部亦套接有其它筒件（圖未示），導致該 鏡頭1的整體筒徑較大。 【發明内容】 因此，本發明之目的，即在提供一種於收納時可薄型 化’且筒徑相對較小的薄型化變焦鏡頭。 於是’本發明薄型化鏡頭是包含一基座單元、一鏡擺 單几、一圓筒凸輪單元 '至少一鏡群單元、一第一彈性件 ，及一第二彈性件。 該基座單元包括一對應一光轴的感光元件及一樞軸。 該鏡擺單元具有一擺動臂，及一連接該擺動臂的鏡片組， 該擺動臂具有一與該樞軸樞接的樞接部及一凸塊。該圓筒 凸輪單元是可轉動地樞接於該基座單元，並具有一呈螺旋 狀的導滑凸輪面，及一推面’該導滑凸輪面是供該凸塊滑 動接觸’以帶動該鏡擺單元沿該光轴移動，該推面是用來 頂推該凸塊，以帶動該鏡擺單元以該樞接部為中心旋轉擺 動。該鏡群單元是沿該光軸設置於該鏡擺單元相反於該感 光7G件的一端。該第一彈性件是設置於該基座單元與該鏡 擺單元之間，該第二彈性件是設置於該基座單元與該鏡擺 單元之間。 當該鏡片組相對該光轴在一拍攝位置時，該第一彈性 件恆頂推該凸塊與該導滑凸輪面滑接，使該鏡擺單元沿該 光軸移動，當該鏡片組相對該光軸在一退避位置時，是藉 該推面項推該凸塊，使該鏡擺單元朝遠離該光軸方向擺動 ’且該第二彈性件頂推該鏡擺單元恆保持由該退避位置旋 轉回到該拍攝位置的趨勢。 【實施方式】 有關本發明之前述及其他技術内容、特點與功效，在 以下配合參考圖式之二個較佳實施例的詳細說明中，將可 清楚的呈現。 在本發明被詳細描述之前，要注意的是，在以下的說 明内容中，類似的元件是以相同的編號來表示。 如圖4、5、1〇所示，本發明薄型化變焦鏡頭之第一較 佳實施例是可裝設於一相機上，該薄型化變焦鏡頭包含一 基座單元2、一鏡擺單元3、一圓筒凸輪單元4、一彈性復 位組件5、一導引件6、一鏡群單元組7，及一迴轉筒8。 本實施例中’為方便圖示，該鏡群單元組7僅示意於圖1〇 、11 〇 該基座早元2包括一底板21、一裝設於該底板21上對 應光軸C的感光元件22、一連接於該底板21上的支撐架 23、一連接於該底板21與該支撐架23之間的樞軸24、一 連接於該底板21上的固定筒25、一驅動件％，及一被該 驅動件26帶動的傳動組件Η。本實施例中，該感光元件 22是用來感應影像，並將影像轉換成可供後續處理的影像 訊號，該驅動件26是一馬達，該傳動組件27是一減速齒 輪系。、 該鏡擺單元3具有一擺動臂31、一凸出該擺動臂31的 導滑部32,及一連接該擺動臂31的鏡片組33,該擺動臂 31具有一與該樞軸24樞接的枢接部311，及一凸塊μ】。 該圓筒凸輪單元4是樞接於該底板21與該支撐架23 之間，並具有一中心軸體41、一部份地圍繞該中心軸體Μ 可供該擺動臂31凸塊312滑接的環型凸輪部42，及一環周 齒43。該環型凸輪部42具有一呈螺旋斜面狀地徑向凸出該 中心軸體41的導滑凸輪面421、一鄰近該導滑凸輪面421 的推面422，及一連接於該導滑凸輪面421與該推面422之 1的連接面423。該導滑凸輪面421是供該凸塊312滑動接 觸，使該鏡擺單元3沿該樞轴24上下移動，該推面422是 用來頂推該凸塊312，使該鏡擺單元3繞該樞轴24擺動， 該傳動組# 27 @-第一齒輪271與該環周# 43唾合帶動 該圓筒凸輪單元4旋轉。 該彈性復位組件5包括一第一彈性件51，及—第二彈 性件52»該第一彈性件51是樞穿過該柩轴24，並具有一 抵接該支樓架23的第一端川’及一抵接該拖接部3ΐι的 1325068 第二端512。該第二彈性件52是樞穿過該樞軸24，並具有 一抵接該支樓架23的第—扭段521，及—抵接該擺動臂31 的第二扭段522 〇本實施例中，該第_彈性件51實質上是 一壓縮彈簧，該第二彈性件52實質上是一扭力彈簧。 該導引件6是連接於該底板21，且具有—導引溝^及 一入口 62 (見圖7)，當該鏡擺單^3沿該光軸c上下移 動時，該鏡擺單it 3的導滑部32是滑接於該導引溝61内 而被導引，該入口 62可提供該導滑部32旋入或旋出該導 引溝61。該鏡群單元組7具有一第一鏡群單元71、一第二 鏡群單it 72 ’及-對焦鏡群單元73，該第—鏡群單元71 ' 該第二鏡群單元72、該對焦鏡群單元73，及該感光元件22 依序是沿該光轴C安裝，且該鏡擺單元3是位於該第二鏡 群單元72與該對线群單元73之^本實關中該鏡 擺單元3實質上是作為一第三鏡群單元。 該迴轉筒8具有一外環齒8卜該傳動組件27除了藉由 該第一齒輪271帶動該圓筒凸輪單元4旋轉外，也藉由一 第二齒輪272與該外環齒81嚙合，同時帶動該迴轉筒8迴 轉，使該迴轉筒8的三根連動銷（圖未示）分別於該固定 筒25的二個凸輪溝（圖未示）内滑動，該迴轉筒8藉以相 對該固定筒25轉動且沿該光轴C上 '下移動，並遠離靠 近該底板21，進而連動該第一、第二鏡群單元71、72伸縮 變焦，由於此種伸縮變焦之技術靥已知技藝，故不在此賢 述。 該鏡片組33可相對該光軸C在一拍攝位置（見圖4〜6 9 1325068 )與一退避位置（見圖7〜9)之間擺動。於該拍攝位置時， 該第一彈性件51的彈性恢復力恆頂推該枢接部311，使該 凸塊312接觸該導滑凸輪面421，該鏡擺單元3可被帶動沿 該光轴C移動以執行變焦功能。於該退避位置時，該鏡片 組33是遠離該光軸c，且該第二彈性件52的彈性恢復力使 該鏡擺單元3丨亙保持由該退避位置旋轉回到該拍攝位置的 趨勢。 該相機關機時，該圓筒凸輪單元4順時針旋轉，該擺 動臂31的凸塊312沿該導滑凸輪面421滑動，該第一彈性 件51頂推該鏡擺單元3沿該光軸c逐漸靠近該感光元件22 ，同時該迴轉筒.8也逐漸靠近該底板21 ^當該凸塊312滑 動至該連接面423，該鏡擺單元3停止沿該光軸c移動，接 著該推面422接觸並頂推該凸塊312，使該擺動臂31以該 樞接部311為中心逆時針旋轉，該鏡片組33同時欏動遠離 該光軸c，且該第二彈性件52的第二扭段522被扭動儲存 彈性位能。如圖7、8、11所示，當該迴轉筒8靠近該底板 21，且該鏡擺單元3旋轉擺動至該迴轉筒8外，該鏡片組 33是位於該退避位置。 該相機開機時，該驅動件26反轉間接帶動該圓筒凸輪 單元4逆時針旋轉，也帶動該迴轉筒8迴轉，同時該第二 彈性件52釋放彈性位能而使該擺動臂31順時針擺動，該 凸塊312經由該連接面423滑動遠離該推面422，並滑動至 該導滑凸輪面421上，使該鏡擺單元3逐漸遠離該感光元 件22，直到該鏡片組33是沿該光轴c移動且該導滑部32 10 被該導引件6的導引溝61導引。此時，如圖斗小⑺所 示，外界光線依序經由該第一鏡群單元71、第三鏡群單元 72、該鏡片組33 ’及該對焦鏡群單元73投射至該感光元件 22 ’該鏡片組33是位於該拍攝位置。 於該拍攝位置時，若該圓筒凸輪單元4繼續逆時針旋 轉，該鏡擺單元3將沿該光轴C繼續遠離該感光元件22而 變焦，使該第一彈性件51纟壓縮而儲存彈性位能。相反地 ，若該圓筒凸輪單元4順時針旋轉，該第一彈性件51可釋 放彈性位能，該鏡擺單元3被頂推沿該光軸c靠近該感光 元件22而變焦。 由以上所述，可知該圓筒凸輪單元4提供螺旋斜面狀 的該導滑凸輪面421與該推面422，而該導滑凸輪面421用 來導滑該鏡擺單元3沿該光轴C移動變焦，該推面422用 來頂推該鏡擺單元3沿該光軸C擺動而退避，且該鏡擺單 元3退避後的空間可供收納該迴轉筒8，本發明收納時得以 薄型化》 經由以上的說明，可再將本發明的優點歸納如下： 一、 本發明的該鏡擺單元3是枢接於該基座單元2上 ’相較於習知的該鏡擺單元13 (’見圖2)是樞接於該直進 筒14内，使該直進筒14必須提供足夠空間供該鏡擺單元 13擺動，因此，本發明的變焦鏡頭不但可以薄型化，也不 需因應該鏡擺單元3的擺動而增加該鏡頭整體之筒徑。 二、 藉由該圓筒凸輪單元4驅使該鏡擺單元3沿該光 軸C移動，也可驅使該鏡擺單元3退避遠離該光轴c而達 11 1325068 成變焦與退避的雙重功效’且構造極為簡單。 值得說明的是，本發明可有以下的設計變化·· -、雖上述實施例中，該圓筒凸輪單元4的連接面奶 是連接該導滑凸輪面421與該推面422,實際運用時，該導 滑凸輪面421可直接連接該推面422而省略該連接面423。 二、雖上述實施例中，該導引件6可“丨該鏡擺單元3 沿該光轴C穩定移動，於實際運用時，只要該第二彈性件 52的彈力適當，該導引件6與該鏡擺單元3的導滑部32可 被省略。 如圖12、13、14所示，為本發明的一第二較佳實施例 ，該第二較佳實施例是類似於該第一較佳實施例，其差異 之處在於：該薄型化變焦鏡頭包含該基座單元2、一鏡擺單 元3、該圓商凸輪單元4、該彈性復位組件$、該導引件6 ，及一鏡群單元組7，。本實施例中，為方便圖示，該鏡群 單元組7·僅示意於圖Η、15。 該鏡擺單元3'具有一擺動臂31'、一導滑部32，，及一鏡 片組33’，該擺動臂31’具有一樞接部311，，及一凸塊312，。 本實施例中，該鏡擺單元3'實質上是一用來對焦的對焦鏡 群單元。該鏡群單元組7·具有一第一鏡群單元71，、一第二 鏡群單元72’，及一第三鏡群單元73ι，該第一、第二、第三 鏡群單元71’、72’、73,，及該感光元件22依序是沿該光轴 C安裝’且該鏡擺單元3ι是位於該第三鏡群單元73,與該感 光元件22之間。 該鏡片組33’可相對該光軸c在該拍攝位置（見圖12、 12 W)與該退避位置（見圖13、15)之間擺動。該相機關機 時，該鏡片組33·相對該光軸C是位於該退避位置，且該鏡 片組33·擺動至遠離該光轴〇該相機開機時，該鏡片組33, 相對該光軸C是位於該拍攝位置，且該光軸c是通過該鏡 片組33’的中心’外界光線可依序經由該第一、第二、第三 鏡群單元7Γ、72’、73, ’及該鏡片組33,後將影像投射至該 感光元件22。 位於該拍攝位置時’該圓筒凸輪單元4旋轉，該導滑 凸輪面421間接驅使該鏡片組33'沿該光袖C相對該感光元 件22移動對焦，該感光元件22感應影像後將影像轉換成 影像訊號，並經由一影像處理器（圖未示）轉換成多數個 評價值，藉以判斷對焦的清晰程度。於該退避位置時，該 推面422間接驅使該鏡片組33’遠離該光轴C而退避，該鏡 群單元組3’得以朝該感光元件22靠近，使鏡頭薄型化。如 此，該第二較佳實施例亦可達到與上述第一較佳實施例相 同的目的與功效》 歸納上述，本發明之薄型化變焦鏡頭，藉由將該鏡擺 單元3樞接於該基座單元2,並藉由該圓筒凸輪單元4的導 滑凸輪面421，以頂推該鏡擺單元3沿該光軸c移動變焦， 且藉由該圓筒凸輪單元4的推面422，以頂推該鏡擺單元3 遠離該光轴C而達到變焦與退避的雙重功效，且使鏡頭的 筒徑較小，於收納時也可薄型化，故確實能達到發明之目 的。 惟以上所述者，僅為本發明之較佳實施例而已，當不 13 1325068 能以此限定本發明實施之範園’即大凡依本發明申請專利 範圍及發明說明内容所作之簡單的等效變化與修飾，皆仍 屬本發明專利涵蓋之範圍内。 【圖式簡單說明】 圖1是習知一種變焦鏡頭部份組件的立體分解示意圖 圖2是習知該鏡頭的側視示意圖，說明一鏡擺單元是 樞接在一直進筒内，且相對一光轴在一退避位置； 圖3是習知該鏡頭的側視示意圖，說明該鏡擺單元相 對該光軸是在一拍攝位置； 圖4是本發明薄型化鏡頭一第一較佳實施例不包含一 鏡群單元組的立體示意圖，說明一鏡擺單元相對一光軸是 在一拍攝位置； 圖5是該第一較佳實施例的局部俯視示意圖，說明該 鏡擺單元相對該光軸是在該拍攝位置； 圖6是該第一較佳實施例的局部側視示意圓，說明該 鏡擺單元相對該光軸是在該拍攝位置； 圖7是該第一較佳實施例的局部立體示意圖，說明該 鏡擺单元相對該光轴是在一退避位置； 圖8是該第一較佳實施例的局部俯視示意圖，說明該 鏡擺單元相對該光軸是在該退避位置； 圖9是該第一較佳實施例的局部側視示意圖，說明該 鏡擺單元相對該光軸是在該退避位置； 圖10是該第一較佳實施例於一伸出狀態時的側面剖視 14 1325068 示意圖’說明該鏡擺單元相對該光軸是在該拍攝位置； 圖11是該第一較佳實施例於一收縮狀態時的側面剖視 示意圖，說明該鏡擺單元相對該光軸是在該退避位置； 圖12是本發明薄型化鏡頭一第二較佳實施例不包含— 鏡群單元組的立體示意圖，說明一鏡擺單元相對該光軸是 在該拍攝位置； 圖13是該第二較佳實施例的局部立體示意圖，說明該 鏡擺單元相對該光軸是在該退避位置； 圖14是該第二較佳實施例於該伸出狀態時的側面剖視 示意圖，說明該鏡擺單元相對該光軸是在該拍攝位置；及 圖15是該第二較佳實施例於該收縮狀態時的側面剖視 示意圖，說明該鏡擺單元相對該光軸是在該退避位置》 15 1325068[Technical Field] The present invention relates to a zoom lens structure, and more particularly to a thinned zoom lens. [Prior Art] Referring to Figures 1, 2, and 3, a part of the assembly of the zoom lens 1 mounted in a camera (not shown) is disclosed in the patent application No. 92103422. 1 includes a base u having a sliding bevel i n, a straight-in ring 12 having a three-linear guide 121, a mirror unit 13, and a continuous advancement 14 «> the mirror unit 13 has a pivoting portion 131, a guide slider 132 slidable on the guide slip surface hi, and a lens group 133 opposite to the pivot joint portion 131. The straight feed cylinder 14 has an eccentric fulcrum 141, and three pairs of linear linear guides 121 Guide groove 142. The eccentric fulcrum 141 is pivotally connected to the pivoting portion 131 of the oscillating unit 13 . The straight-moving tube 14 can be moved away from the straight-in ring 12 by the sliding guides 142 and the sliding fit of the linear guides 121 . The straight-through ring 12 can also be moved by a cam barrel (not shown) located outside the straight-moving cylinder 14 along the optical axis z, away from the base ιβ. When the straight-moving cylinder 14 and the straight-in ring 12 are respectively driven along When the optical axis 靠近 is close to the base 11, the guide slider 132 slides on the sliding slope m: the mirror pendulum S 13 is further swung away from the straight-moving cylinder 14 around the frame connecting portion 131. The optical axis z, when the camera is turned off, the mirror unit 134a is in a retracted position for the optical axis 2 (see oppositely, when the straight-moving cylinder 14 and the straight-in ring 12 are respectively driven along the optical axis Z When the base 11 is away from the base 11, the guide slider 132 slides on the sliding surface 111, and a resilient restoring force generated by a torsion spring (not shown) in the pivoting portion 131 drives the mirror unit 13 to The connecting portion 131 is centered and is close to the optical axis Z. At this time, the camera is turned on, and the mirror unit is 13 is opposite to the optical axis z at a shooting position (see Fig. 3). The mirror unit 13 can swing away from the optical axis Z' inside the straight-moving cylinder 14 to make the lens 1 thinner when stored, however The lens 1 has the following disadvantages: the straight-moving cylinder 14 must provide sufficient space for the mirror unit 13 to swing therein, so that the diameter of the straight-moving cylinder 14 must be large enough, and the straight-through cylinder 14 is also sleeved outside. The other cylindrical member (not shown) causes the overall diameter of the lens 1 to be large. [Invention] Therefore, it is an object of the present invention to provide a thin type which is thinner when stored and has a relatively small cylinder diameter. The zoom lens of the present invention comprises a base unit, a mirror unit, a cylindrical cam unit, at least one mirror unit, a first elastic member, and a second elastic member. The base unit includes a photosensitive element corresponding to an optical axis and a pivot. The mirror unit has a swing arm, and a lens group connecting the swing arm, the swing arm has a pivotal portion pivotally connected to the pivot And a bump. The cylindrical cam unit is Rotatablely pivotally connected to the base unit, and has a spiral sliding guide cam surface, and a pushing surface 'the sliding sliding cam surface is for the sliding contact of the bump' to drive the mirror unit along the light The axis is moved to push the bump to push the mirror unit to rotate around the pivoting portion. The mirror group unit is disposed along the optical axis of the mirror unit opposite to the photosensitive One end of the 7G member. The first elastic member is disposed between the base unit and the mirror unit, and the second elastic member is disposed between the base unit and the mirror unit. When the optical axis is in a shooting position, the first elastic member constantly pushes the bump to slide with the sliding cam surface, so that the mirror unit moves along the optical axis when the lens group is opposite to the optical axis. When the position is retracted, the bump is pushed by the push item to swing the mirror unit away from the optical axis, and the second elastic member pushes the mirror unit to keep rotating from the retracted position. The trend of the shooting position. The above and other technical contents, features and effects of the present invention will be apparent from the following detailed description of the preferred embodiments of the invention. Before the present invention is described in detail, it is noted that in the following description, similar elements are denoted by the same reference numerals. As shown in FIGS. 4, 5, and 1 , a first preferred embodiment of the thinned zoom lens of the present invention is mountable on a camera, and the reduced zoom lens includes a base unit 2 and a mirror unit 3. A cylindrical cam unit 4, an elastic reset assembly 5, a guide member 6, a mirror group unit group 7, and a rotary cylinder 8. In the present embodiment, for convenience of illustration, the mirror group unit group 7 is only illustrated in FIGS. 1A and 11 . The base unit 2 includes a bottom plate 21 and a photosensitive light corresponding to the optical axis C mounted on the bottom plate 21. a component 22, a support frame 23 connected to the bottom plate 21, a pivot 24 connected between the bottom plate 21 and the support frame 23, a fixed cylinder 25 connected to the bottom plate 21, and a driving member %, And a transmission assembly 带 driven by the driving member 26. In this embodiment, the photosensitive element 22 is used to sense an image and convert the image into an image signal for subsequent processing. The driving member 26 is a motor, and the driving assembly 27 is a reduction gear train. The mirror unit 3 has a swing arm 31, a guide portion 32 protruding from the swing arm 31, and a lens group 33 connecting the swing arm 31. The swing arm 31 has a pivotal connection with the pivot shaft 24. The pivoting portion 311, and a bump μ]. The cylindrical cam unit 4 is pivotally connected between the bottom plate 21 and the support frame 23, and has a central shaft body 41 partially surrounding the central shaft body 可供 for sliding the convex block 312 of the swing arm 31. The annular cam portion 42 and a circumferential tooth 43. The annular cam portion 42 has a sliding cam surface 421 that radially protrudes from the central shaft body 41 in a spiral inclined shape, a pushing surface 422 adjacent to the sliding sliding cam surface 421, and a connecting sliding guide cam A connecting surface 423 of the surface 421 and the one of the pushing surfaces 422. The sliding cam surface 421 is slidably contacted by the protrusion 312 to move the mirror unit 3 up and down along the pivot axis 24, and the pushing surface 422 is used for pushing the protrusion 312 to wind the mirror unit 3. The pivot 24 is swung, and the transmission group # 27 @-the first gear 271 is spit with the circumference #43 to rotate the cylindrical cam unit 4. The elastic restoring assembly 5 includes a first elastic member 51, and a second elastic member 52. The first elastic member 51 pivots through the cymbal 24 and has a first end abutting the branch frame 23. Chuan' and a 1325068 second end 512 that abuts the drag portion 3ΐ. The second elastic member 52 pivots through the pivot shaft 24 and has a first twisting portion 521 abutting the branch frame 23 and a second twisting portion 522 abutting the swing arm 31. The first elastic member 51 is substantially a compression spring, and the second elastic member 52 is substantially a torsion spring. The guiding member 6 is connected to the bottom plate 21, and has a guiding groove ^ and an inlet 62 (see FIG. 7). When the mirror pendulum unit 3 moves up and down along the optical axis c, the mirror pendulum single it The guide portion 32 of the third portion is guided in the guide groove 61, and the inlet 62 can provide the guide portion 32 to be screwed into or out of the guide groove 61. The mirror group unit group 7 has a first mirror group unit 71, a second mirror group unit it 72' and a focusing mirror group unit 73, the second mirror group unit 71', the second mirror group unit 72, the focus The mirror group unit 73, and the photosensitive element 22 are sequentially mounted along the optical axis C, and the mirror unit 3 is located in the second mirror group unit 72 and the pair of line group units 73. Unit 3 is essentially a third mirror group unit. The rotary cylinder 8 has an outer ring gear 8. The transmission assembly 27 is meshed with the outer ring gear 81 by a second gear 272 in addition to the rotation of the cylindrical cam unit 4 by the first gear 271. The rotary cylinder 8 is rotated, so that three interlocking pins (not shown) of the rotary cylinder 8 slide in the two cam grooves (not shown) of the fixed cylinder 25, and the rotary cylinder 8 is opposite to the fixed cylinder 25 Rotating and moving down along the optical axis C, and away from the bottom plate 21, and then interlocking the first and second mirror group units 71, 72 to zoom and zoom, because the technology of such telescopic zoom is known, This sage. The lens group 33 is swingable relative to the optical axis C between a shooting position (see FIGS. 4 to 6 9 1325068) and a retracted position (see FIGS. 7 to 9). In the shooting position, the elastic restoring force of the first elastic member 51 pushes the pivoting portion 311 to make the protrusion 312 contact the sliding cam surface 421, and the mirror unit 3 can be driven along the optical axis. C moves to perform the zoom function. In the retracted position, the lens group 33 is away from the optical axis c, and the elastic restoring force of the second elastic member 52 causes the mirror unit 3 to maintain a tendency to be rotated back to the photographing position by the retracted position. When the camera is turned off, the cylindrical cam unit 4 rotates clockwise, the protrusion 312 of the swing arm 31 slides along the guide sliding cam surface 421, and the first elastic member 51 pushes the mirror unit 3 along the optical axis c Gradually approaching the photosensitive element 22, and the rotating cylinder .8 is also gradually approaching the bottom plate 21. When the bump 312 slides to the connecting surface 423, the mirror unit 3 stops moving along the optical axis c, and then the pushing surface 422 Contacting and pushing the protrusion 312 to rotate the swing arm 31 counterclockwise around the pivoting portion 311, the lens group 33 simultaneously tilts away from the optical axis c, and the second elastic member 52 is twisted second. Segment 522 is twisted to store elastic potential energy. As shown in Figs. 7, 8, and 11, when the rotary cylinder 8 is adjacent to the bottom plate 21, and the mirror unit 3 is rotatably swung out of the rotary cylinder 8, the lens group 33 is located at the retracted position. When the camera is turned on, the driving member 26 reversely indirectly drives the cylindrical cam unit 4 to rotate counterclockwise, and also drives the rotary cylinder 8 to rotate, and the second elastic member 52 releases the elastic potential energy to make the swing arm 31 clockwise. Swinging, the bump 312 slides away from the pushing surface 422 via the connecting surface 423, and slides onto the sliding cam surface 421, so that the mirror unit 3 gradually moves away from the photosensitive element 22 until the lens group 33 is along the The optical axis c moves and the guide portion 32 10 is guided by the guiding groove 61 of the guiding member 6. At this time, as shown in FIG. 3 (7), external light is sequentially projected to the photosensitive element 22 via the first mirror group unit 71, the third mirror group unit 72, the lens group 33', and the focus group unit 73. The lens group 33 is located at the shooting position. In the shooting position, if the cylindrical cam unit 4 continues to rotate counterclockwise, the mirror unit 3 will continue to zoom away from the photosensitive element 22 along the optical axis C, so that the first elastic member 51 is compressed and stored elastic. Potential energy. Conversely, if the cylindrical cam unit 4 rotates clockwise, the first elastic member 51 can release the elastic potential energy, and the mirror unit 3 is pushed up along the optical axis c to approach the photosensitive member 22 to be zoomed. From the above, it can be seen that the cylindrical cam unit 4 provides the spiral sliding surface of the sliding cam surface 421 and the pushing surface 422, and the sliding sliding cam surface 421 is used to guide the mirror unit 3 along the optical axis C. The zooming surface 422 is used to push the mirror unit 3 to swing along the optical axis C to retreat, and the space behind the mirror unit 3 is retractable for accommodating the rotating cylinder 8. The invention is thinned during storage. Through the above description, the advantages of the present invention can be further summarized as follows: 1. The mirror unit 3 of the present invention is pivotally connected to the base unit 2 'Compared to the conventional mirror unit 13 (' 2) is pivotally connected to the straight-moving cylinder 14, so that the straight-moving cylinder 14 must provide sufficient space for the mirror unit 13 to swing. Therefore, the zoom lens of the present invention can be thinned and does not need to be mirrored. The swing of the unit 3 increases the overall cylinder diameter of the lens. The driving of the mirror unit 3 along the optical axis C by the cylindrical cam unit 4 can also drive the mirror unit 3 to retreat away from the optical axis c to achieve the dual function of zooming and retracting 11' The construction is extremely simple. It should be noted that the present invention may have the following design changes: In the above embodiment, the connection surface milk of the cylindrical cam unit 4 is connected to the guide sliding cam surface 421 and the pushing surface 422. The guide cam surface 421 can be directly connected to the push surface 422 to omit the connection surface 423. 2. In the above embodiment, the guiding member 6 can “stablely move the mirror unit 3 along the optical axis C. In actual use, the guiding member 6 is suitable as long as the elastic force of the second elastic member 52 is appropriate. The guide portion 32 of the mirror unit 3 can be omitted. As shown in Figures 12, 13, and 14, a second preferred embodiment of the present invention is similar to the first In a preferred embodiment, the difference is that the thinned zoom lens comprises the base unit 2, a mirror unit 3, the circular cam unit 4, the elastic reset assembly $, the guide member 6, and a The mirror group unit group 7. In the present embodiment, for convenience of illustration, the mirror group unit group 7 is only shown in Fig. 15. The mirror unit 3' has a swing arm 31' and a guide portion 32. And a lens group 33', the swing arm 31' has a pivoting portion 311, and a bump 312. In this embodiment, the mirror unit 3' is substantially a focusing mirror for focusing The group unit 7 has a first mirror group unit 71, a second mirror group unit 72', and a third mirror group unit 73ι, the first 2. The third mirror group unit 71', 72', 73, and the photosensitive element 22 are sequentially mounted along the optical axis C, and the mirror unit 3 is located at the third mirror group unit 73, and the photosensitive The lens group 33' is swingable relative to the optical axis c between the shooting position (see Figs. 12, 12 W) and the retracted position (see Figures 13, 15). When the camera is turned off, the lens The lens group 33 is located at the retracted position relative to the optical axis C, and the lens group 33 is swung away from the optical axis. When the camera is turned on, the lens group 33 is located at the shooting position with respect to the optical axis C, and the lens group 33 The optical axis c is through the center of the lens group 33'. External light can be sequentially passed through the first, second, and third mirror group units 7Γ, 72', 73, 'and the lens group 33, and then the image is projected to The photosensitive element 22 is located at the shooting position. The cylindrical cam unit 4 rotates, and the sliding cam surface 421 indirectly drives the lens group 33' to move the focus along the light sleeve C relative to the photosensitive element 22, and the photosensitive element 22 senses After the image is converted into an image signal, and converted into an image by an image processor (not shown) The evaluation value is used to determine the degree of sharpness of the focus. In the retracted position, the push surface 422 indirectly drives the lens group 33' away from the optical axis C, and the lens group unit 3' is brought toward the photosensitive element 22 Thus, the lens is made thinner. Thus, the second preferred embodiment can achieve the same purpose and effect as the first preferred embodiment described above. In summary, the thinned zoom lens of the present invention is obtained by using the mirror unit 3 pivotally connected to the base unit 2, and by the sliding cam surface 421 of the cylindrical cam unit 4, pushing the mirror unit 3 to move the zoom along the optical axis c, and by the cylindrical cam unit The pushing surface 422 of the fourth embodiment pushes the mirror unit 3 away from the optical axis C to achieve the dual functions of zooming and retracting, and the lens has a smaller diameter and can be thinned during storage, so that the invention can be achieved. The purpose. However, the above is only a preferred embodiment of the present invention, and the simple equivalent of the scope of the invention and the description of the invention is not limited to 13 1325068. Variations and modifications are still within the scope of the invention. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective exploded view of a conventional zoom lens assembly. FIG. 2 is a side elevational view of a conventional lens, illustrating that a mirror unit is pivotally connected into a continuous cylinder and is opposite to each other. The optical axis is in a retracted position; FIG. 3 is a schematic side view of the lens, illustrating that the mirror unit is in a shooting position relative to the optical axis; FIG. 4 is a first preferred embodiment of the thinned lens of the present invention. A perspective view of a mirror group unit, wherein a mirror unit is in a shooting position with respect to an optical axis; FIG. 5 is a partial top view of the first preferred embodiment, illustrating that the mirror unit is opposite to the optical axis 6 is a partial side schematic circle of the first preferred embodiment, illustrating that the mirror unit is in the photographing position with respect to the optical axis; FIG. 7 is a partial perspective view of the first preferred embodiment. The schematic view shows that the mirror unit is in a retracted position with respect to the optical axis; FIG. 8 is a partial top plan view of the first preferred embodiment, illustrating that the mirror unit is in the retracted position with respect to the optical axis; The first comparison A partial side view of the embodiment, illustrating that the mirror unit is in the retracted position relative to the optical axis; FIG. 10 is a side cross-sectional view of the first preferred embodiment in an extended state, 14 1325068. The unit is in the photographing position with respect to the optical axis; FIG. 11 is a side cross-sectional view showing the first preferred embodiment in a contracted state, illustrating that the mirror unit is in the retracted position with respect to the optical axis; A second preferred embodiment of the thinned lens of the present invention does not include a three-dimensional schematic view of a group of mirror elements, illustrating that a mirror unit is in the photographing position with respect to the optical axis; FIG. 13 is a partial view of the second preferred embodiment. 3 is a perspective view showing the mirror unit in the retracted position with respect to the optical axis; FIG. 14 is a side cross-sectional view showing the second preferred embodiment in the extended state, illustrating that the mirror unit is opposite to the optical axis In the photographing position; and FIG. 15 is a side cross-sectional view of the second preferred embodiment in the contracted state, illustrating that the mirror unit is in the retracted position relative to the optical axis" 15 1325068
【主要元件符號說明】 2…… •…基座單元 41 ·.·.· •…中心軸體 21…… —底板 42···.· …·環型凸輪部 22·.··· ----感光元件 421… …·導滑凸輪面 23…… …·支撐架 422… …·推面 24.…… …·樞轴 423… •…連接面 25 •…固定筒 5…… •…彈性復位組件 26 •…驅動件 51 ••… •…第一彈性件 27··.·. •…傳動組件 511… •…第一端 271… •…第一齒輪 512… …·第二端 272… •…第二齒輪 52···.. -…第二彈性件 3 ....... •…鏡擺單元 521… …·第一扭段 31…… …·擺動臂 522… •…第二扭段 311… 接 6…… •…導引件 312… …·凸塊 61 ·…· •…導引溝 32…… •…導滑部 62····. …入口 33…… …鏡片組 7…… …·鏡群單元組 3'....... …鏡擺單元 71 ·.·· …·第一鏡群單元 31' …擺動臂 72·.··. •…第二鏡群單元 31Γ · 拒接部 73 ….· •…對焦鏡群單元 312' ··· …凸塊 7'....... •…鏡群單元組 32, ·…· …導滑部 7Γ… •…第一鏡群單元 33,…·· …鏡片組 12' •… …第二鏡群單元 4 ....... …圓筒凸輪單元 73, .··. …第三鏡群單元 16 1325068 8…… .....迴轉琦 C ···.· .....光軸 81… ••…外環齒[Description of main component symbols] 2... •...Base unit 41 ····· •...Center shaft body 21...-Base plate 42·······Ring type cam unit 22·.··· -- - Photosensitive element 421 ... ... guide sliding cam surface 23 ... ... support frame 422 ... ... push surface 24 ... ... ... pivot 423 ... • ... connection surface 25 • ... fixed cylinder 5 ... • ... elasticity Reset assembly 26 •... drive member 51 ••... •...first elastic member 27·····....drive assembly 511... •...first end 271... •...first gear 512......second end 272... •...Second gear 52···.. -...Second elastic member 3 ................... Mirror unit 521... First twist section 31... Swing arm 522... The second twisting section 311... is connected to 6... •...the guiding member 312...the bumping member 61·...·...the guiding groove 32...the guiding guide portion 62····....the entrance 33......the lens Group 7............·Mirror group unit group 3'............. Mirror unit 71 ················································· Mirror group unit 31 Γ · reject unit 73 ..... • Focusing lens group unit 312'····bumps 7'...........mirror group unit group 32, ........guide sliding portion 7Γ...•...first mirror group unit 33,...·· ...lens group 12' •...second mirror group unit 4 . . . ... cylinder cam unit 73, . . . . ... third mirror group unit 16 1325068 8...... ..... C ···.· ..... optical axis 81... ••... outer ring tooth
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